specifications of white led based home lighting systems

8/3/2019 Specifications of white LED based home lighting systems

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Specifications of White-LED based Home Lighting Systems

A LED based solar home lighting system aims at providing electricity for operating LEDlights and other small DC loads for specified hours of operation per day.

White Light Emitting Diode (W-LED) is a solid state device which emits light whenelectric current passes through it. A LED based solar Home lighting system consists ofa PV Module, control electronics, battery, and W-LED based Luminaires. The battery ischarged by electricity generated through the PV module during the day time and theluminaires provide the light as and when required.

BROAD PERFORMANCE SPECIFICSTIONS

The broad performance specifications of a W-LED light source based solar homelighting system are given below:

Light Source White Light Emitting Diode (W-LED)Light Out put White colour (colour temperature 55000-65000K)

Minimum 15 LUX when measured at the periphery of 2.5meter diameter from a height of 2.5 meter. At any pointwithin area of 2.5mtr diametre periphery the light level shouldnot be more than three limes of the periphery value. Theillumination should be uniform without dark Bands or abruptvariations and soothing to the eyes. Higher output would be

Mounting of light Wall or ceiling

Electronics Min 85 % efficiency

Average duty cycle 5 hours a dayAutonomy 3 days (Minimum 12 operating hours per permissible

discharge

There will be four models of W-LED home lighting systems. The configuration ofeach model is as follows:

Model-I One White LED lumaniare

PV Module 6 Wp under STC, measured at 16.4V as Vload. Module Voc minimum of

21V. Battery Sealed maintenance free, 12V-7 AH @ C/20, Max DoD- 75%

Model- II Two White LED lumanaire

PV Module 12 Wp under STC, measured at 16.4 V as Vload. Module Voc minimum of12V. Battery Lead acid flooded or VRLA, 12V - 12AH @ C/20, Max DoD-75%

Model III Two White LED lumenaire and one DC fan of wattage up to 10 W

PV Module 24 Wp under STC, measured at 16.4 V as Vload. Module Voc minimum of21V. Battery Lead acid flooded or VRLA, 12V- 20AH @ C/20, Max DoD-75%


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Model IV Four White LED

PV Module 24 Wp under STC, measured at 16.4 V as Vload. Module Voc minimum of21 V. Battery Lead acid flooded or VRLA, 12 V- 20 AH @ C/20, Max DoD-75%

Other Details

DUTY CYCLE

The LED solar home lighting system should be designed to operate for average 5 hoursa Day and fan for 3-4Hrs, under average daily insolation of 5.5 kWh/sq.m . on ahorizontal surface.

LIGHT SOURCE

(i) The light source will be of white LED type. Single lamp or multiple lamps can

be used. The colour temperature of W-LEDs used in the system should be inthe range of 5500oK6500oK. Use of LEDs which emit ultraviolet light will notpermitted.

(ii) The light output from the W-LED light source should be constant throughoutthe duty cycle.

(iii) The lamps should be housed in an assembly suitable for indoor use with anappropriate heat sink to dissipate heat generated during operation. Thetemperature of LED should not increase more than 10o above roomtemperature. This condition should be complied for 5 hours of operation of thelamp at a stretch while battery operating at any voltage between the loaddisconnect and the charge regulation set point.

(iv) The make, model number, country of origin and technical characteristics(including IESNA LM-80 report) of W-LEDs used in the lighting systemmust be furnished to the Test Centers and to the buyers. In absence of thisdata the solar home lighting system may not be tested by the Test Center.

BATTERY

(i) Sealed Maintenance Free or Tubular positive plate lead acid Flooded or VRLAbattery. Battery should conform to latest BIS standards. In view of non-availability of adequate test facilities for testing as per BIS standard in thecountry, existing facilities of battery manufacturers will be utilized by way of

periodic quality audit by MNRE/BIS or their representative to ensureconformance of BIS standards.

(ii) Also initially for a period of six months from the date of the issue of theseguidelines capacity test, Ampere-Hour (Ah) & Watt-Hour (Wh) efficiencytest and charge retention tests per BIS standards may be used.

(iii) It is also mandatory for the battery manufacturers/ bulk users to complywith batteries (Management and handling) Rules 2001 of MOEF, asamended.

(iv) At least 75% of the rated capacity of the battery should be between fullycharged and load cut off conditions.


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ELECTRONICS

(i) The total electronic efficiency should be at least 85 %.(ii) Electronics should operate at 12 V and should have temperature

compensation for proper charging of the battery throughout the year.(iii) The light output should remain constant with variations in the battery voltages.(iv) Necessary lengths of wires/cables, switches suitable for DC use and fuses

should be provided.

PV MODULE

(a) The PV module (s) shall contain mono/ multi crystalline silicon or thin film solarcells. In case of crystalline silicon solar cell module it is required to have certificate forthe supplied PV module as per IEC 61215 specifications or equivalent National or

International Standards whereas in case of thin film solar cell module it is required tohave certificate for the supplied PV module as per IEC 61646 specifications orequivalent National or International Standards. In case of thin film modules for eachmodel the modules should fulfill the wattage criterion after light soaking degradation.

In case the supplied PV module is not a module of regular production of themanufacturer and does not have certificate as above then the manufacturer shouldhave the required certification for at least one of the irregular modules. Further, themanufacturer should certify that the supplied module is also manufactured using samematerial, design and process similar to that of certified PV module.

In case of imported modules it is mandatory to provide a copy of the internationalproduct qualification certificate to the test centre

(b) The power output of the PV module must be reported under standard testConditions (STC) at 16.4 Volt loading voltage. I-V curve of the sample module shouldbe submitted to the Test Center at the time of system qualification testing.(c) The open circuit voltage of the PV modules under STC should be at least 21.0Volts.(d) The terminal box on the module should have a provision for opening for replacingthe cable, if required.

(e) Identification and Traceability: Each PV module used in any solar power projectmust use a RF identification (RFID) tag. The following information must be mentioned inthe RFID used on each module (This can be inside or outside the laminate, but must beable to withstand harsh environmental conditions).

a) Name of the Manufacturer or distinctive Logob) Model or Type No.c) Serial No.d) Year of manufacture

ELECTRONIC PROTECTIONS


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1. The system should have protection against battery overcharge and deep

discharge conditions. The numerical values of the cut off limits must be specified,while submitting the samples for the testing purposes.

2. Fuses should be provided to protect against short circuit conditions.

3. A blocking diode should be provided as part of the electronics, to prevent reverseflow of current through the PV module(s). In case such a diode is not providedwith the PV module, full protection against open circuit, accidental short circuitand reverse polarity should be provided.

4. Electronics should operate at 12 V and should have temperature compensationfor proper charging of the battery throughout the year.

MECHANICAL COMPONENTS

(i) Metallic frame structure (with corrosion resistance paint) to be fixed on theroof of the house to hold the SPV module. The frame structure should have

provision to adjust its angle of inclination to the horizontal between 0 and 45degree, so that it can be installed at the specified tilt angle.(ii) It should be possible to mount the light source on a wall or ceiling or hang it

from the ceiling in a stable manner.(iii) A vented plastic/ wooden/ metallic box with acid proof corrosion resistance

paint for housing the storage battery indoors should be provided.

OTHER FEATURES

(i) The system should be provided with t w o LED indicators: a green light toindicate charging in progress and a red LED to indicate deep dischargecondition of the battery. The green LED should glow only when the battery isactually being charged.

(ii) There will be a Name Plate on the system body which will give:

(a) Name of the Manufacturer or Distinctive Logo.(b) Model Number(c) Serial Number(d) Year of manufacture

QUALITY AND WARRANTY

( i ) Components and parts used in W-LED based solar home lighting systems

should conform to the latest BIS/ International specifications, wherever such

specifications are available and applicable. A copy of the test report/

certificate stating conformity of BIS/ International standards must be

submitted to the Test Centre.

( i i ) The PV module will be warranted for a minimum period of 20 years from the

date of supply. The W-LED solar home lighting system (excludingthe battery)

will be warranted for a period of at least 5 years from the date of supply.


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(iii) The sealed maintenance free battery should be warranted for a period of at

least two year (DOD 25 to 30%). The lead acid flooded type battery or VRLA

battery should be warranted for a period of 5 years.

(iv) The manufacturers of W-LED based solar home lighting system are requiredto provide to the Test Center a detailed report on the tests performance by

them and the actually measured values of PV module, electronics, LEDs andbattery and other related parameters, as per MNRE specifications. Meremention of compliance to MNRE specifications is not acceptable and suchsamples may not be tested by the Test Center.

DOCUMENTATION

An Operation, Instruction and Maintenance Manual, in English and the local language,should be provided with the solar home lighting system.

The following minimum details must be provided in the Manual:

(a) About Photovoltaics.(b) A small write up (with a block diagram) on PV Module, electronics, lamps

and battery.(c) About W-LED solar home lighting system - its components and expected

performance.The make, model number, country of origin and technical characteristics ofW- LEDs should be stated in the product data sheet.

(d) Clear instructions about mounting of Pole, Grouting details, fixing of PVmodule, battery box and luminaire. Clear wiring instructions with linediagram.

(e) About significance of indicators.(f) DO's and DONT's.(g) Clear instructions on regular maintenance and trouble shooting of the

system.(h) Name and address of the person or service center to be contacted in case

of failure or complaint.

specifications of white led based home lighting systems

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